Improved mining-machine



, itu.

.www w DAVID `VVILIIIAMSN, OF ELIZABETH, PENNSYLVANIA.

Letters'Patcnt No. 87,453, dated Mtr/rch 2, 1869.

IMPROVBD MINING-MACHINE.

The Schedule 4referred to in these Letters Patent and making part of the name.

To. all lwhom -it may concern:

Be' it known that I, DAVID WILLIAMSON, of Elizabeth, in the county of Allegheny, and in the State of Pennsylvania, have invented anew and useful Machine for Mining; and I do hereby declare that the following is a full, clear, andfexact description thereof, reference being had to the accompanying drawings, which make part of this specification, and in which- Avarious kinds, 85o., in which the position of the cutting-tool can be varied at pleasure,'to conform to the variations of level in the vein or bearing, without altering its relation tothe driving-mechanism, and likewise to provide aconvenient and eicacious tool for use in connection with the same; to which ends,

4My improvements consist- First, in mounting the saw-mandrel in bearings in the "free ends of arms, which are pivoted upon a movable'earriage, concentric with the driving-wheel, from which the said mandrel receives its motion in such manner, that by traversing' the arms upon circular guides, secured to the carriage, the horizontal position of the mandrel an be varied to conform to the inclination of the vein, without interrupting its connection with the -t'iriving-wheel.

Secoii l, in a cylindrical saw or auger, having teeth at itsV front or cutting-end, and provided with spiral corrugations extending thence toward its rear, for the purpose of carrying ori' the dust or chips formed by the teeth when in operation, the same escaping through holes in the periphery of the auger, made for that purpose.

In the accompanying drawings, which show a convenient arrangement of parts for carrying out the objects of my inventioni p A represents a movable carriage, supported upon wheels a, which may be hanged to run upon a railwaytrack,`i f desired.

B represents the saw-mandrel, which is mounted in bearings in the freexends of the arms C C, which are pivoted to the bearings C' C upon the carriage A, and concentric with the driving-shaft E.

Jaws, c?, are formed upon the arms C, near their free ends, which embrace circular guides D I),secured upon the carriage A, which guidesare likewise concentric with the driving-shaft E.

The arms G can be swung into any position upon the guides D, and clamped by the set-screw c, so that the horizontal' position of the saw-mandrel can be varied at pleasure, wit-hout altering its distance from the drivingshaft, and the two are thus maintained in gear, no matter what position may be assigned to the arms. l The driving-shaft E is mounted in bearings e' upon the carriage A, and may be operated by any suitable power, either through the treadle IF, pulley E?, or a crank, as found most convenient. It carries a large driving-pulley, E, from which motion is communicated to a small pulley, l), on the saw-mandrel B, by the` belt c, the relative diameters of the two pulleys depending upon the rapidity with which the saw is to be rotated.

'The mandrel B is susceptible of end motion in its bearings, to the extent of the depth of cut required, and the pulley b is therefore made of suicient length to allo1 the distance to be traversed, without interruptf ing its connection with the driving-pulley E'.

The mandrel likewise carries a balance-wheel,- b, to regulate its motions.

Gearing may be substituted for the pulleys, if deemed preferable ;d and in that case, the pinion upon the mandrel B maybe of the same width as its driving-gear, and rotate upon a feather on the mandrel,to admit of the longitudinal motion of the same, or a reverse arrangement may be adopted, a feather upon the pinion entering a longitudinal groove in the mandrel.

In the process of mining to which this machine is particularly adapted, a series of holes is bored in the two feet in depth, for the purpose of forming lines of fracture for the dislodgment and removal oi the coal or orc, and, by the arrangement just decribed, the direction of these lines may be readily made conformable to that of the vein. It is furthermore desirable to employ a tool which will bore with facility a hole from which the core can be easily removed, and which, in practice, is usually about two inches in diameter.

For this purpose I employ a cylindrical saw, or auger G, screwed, keyed, or otherwise secured upon the man- Vdrel B, and having saw-teeth, g,all round its outer or toward its rear, near which are formed openings, g2.

The dust or chips made by the saw-teeth when in operation are carried backward by the spiral corrugations, and drop ont through the openings g2, thereby presenting no impediment to the operation of the saw, and enabling the core to be readily removed.

The saw is-fed into the material to be bored, by the spiral springs h2, which encircle the guide-rods h, secured to the movable arm C which is farthest from the rods, andaiJ sliding cross-head, H, which moves longitudinally' upon them, and bears in turn against the end of the mandrel B, by which means the saw is caused same.

The guides D may be either circular or segmental vein orbearing', contiguous to each other, and about cutting-end, from which spiral corrugations, g, extend saw, and bear against fixed collars h, secured upon the to advance into the vein in proportion as it cuts the' and of any form of cross-section preferred, and may either form one piece with the bearings C', or be made separate.

Having thus fully described my invention,

What I claim therein :Ls new, and desire to seein-e by Letters Patent, isl. The arms C C, pivoted upon :L frmne or carriage concentrionlly with the driving-axle f the machine, and carrying the sztw-mandrei, in combination with the Circular or segmental guides D D, as set forth.

2. The guide-rods h h, and spiral springs k, in Combination with the cross-head H and smv-mandrel B, arranged and operating substantially as and for the purpose set forth.

3. The imme A, driving-shaft E, and driving-pnl ley E', in Combination with the circular or segmental guides D, wmagN C, and smv-lnn-mh'el B, arranged und operating substantially as und for the purposes eie-4 DAVID VVILLIAMS'ON. 

